Why does all light have a wavelength between about 400 and 700 nm?

A1kg cart slams into a stationary 1kg cart at 2 m/s. the carts stick together and move forward at a speed of 1 m/sl. determine whether kinetic energy was conserved in the collision. use the law of conservation of energy to explain the collision

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?